A network system receives an order request from a requesting device including a list of requested items and a delivery location. The network system may create an order entry by selecting a source location and a provider for the order. The network system sends order information from the order entry to a provider device of the selected provider and a source device corresponding to the source location, where the order information includes an order identifier, a source identifier, and a provider identifier. The provider device broadcasts a beacon including the source identifier and the order identifier. The provider device detects a short range beacon signal from the source device and determines whether the detected source identifier and order identifier match the received source identifier and order identifier from the order information. Responsive to a successful match the provider device verifies its proximity to the source device.